auerbach



(No Model.) 2 Sheets-Sheet 1.

M. AUERBAOH. DELIVERY DEVICE FOR LITHOGRAPHIG PRESSES FOR PRINTING METALSHEETS.

No. 550,813. Patented De0.3,18*95.

(No Model.) 2 Sheets-Sheet 2.

M. AUERBAOH. DELIVERY DEVIUE FOR LITHOGRAPHIG PRESSESEFOR PRINTING METALSHEETS.

Patented Dfeb finl 9 5.

ANDREW ABRAHAM. PHOT0-LFTHO.WASHIN GTON. D C

lhuirnn firarns PATENT Fries.

MORITZ AUERBACH, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE FUCHS dz LANGMANUFACTURING COMPANY, OF SAME PLACE.

DELIVERY DEVICE FOR LITHOGRAPHIC PRE SSES FOR PRINTING METAL SHEETS.

SPECIFICATION forming part of Letters Patent No. 550,813, dated December3, 1895 Application filed January 8, 1895. Serial No. 534,235. (Nomodel.)

To aZZ whom it may concern.-

Be it known that I, MORITZ AUER'BACH, a citizen of Germany, and aresident of Brooklyn, in the county of Kings and State ofNew York, haveinvented certain new and useful Improvements in Delivery Devices forLithographic Presses for Printing Metal Sheets, of which the followingis a specification.

This invention relates to a new and improved attachment for lithographicpresses used for printing on sheet metal; and the object of my inventionis to provide an attachment for throwing off the printed metal sheet insuch a manner that the printed face of the same appears at the top, thuspreventing the defacing of the printed matter by sliding the printedface upon or over the receiving-table.

The invention consists in the combination, with a printing-cylinder andan impressioncylinder above the same, of a gripper-shaft mounted in theimpression-cylinder, an arm on one end of the gripper-shaft, a circulartrack fixed at one end of the impression-cylinder concentric therewith,and a cam held adjustably on said track for the purpose of tripping thearm of the gripper-shaft and opening the grippers shortly after that endof the sheet opposite the one held by the grippers is released frombetween the printingcylinder and the impression-cylinder.

The invention also consists in the construction and combination of partsand details, as will be fully described and set forth hereinafter, andfinally pointed out in the claim.

In the accompanying drawings, forming a part of this specification, andin which like letters of reference indicate like parts in all the views,Figure 1 is a side view of a lit-hographic printing-press provided withmy improved sheet-delivery attachment, parts being in section and partsomitted. Fig. 2 is a plan view of part of the hinged receiving-table.Figs. 3-, 4, and 5 are diagram end views of the cylinder and grippingdevices, showing the parts in different positions.

The printing-cylinder A is mounted in the side standards A of the frameA in the usual manner. This cylinder is provided withlongitudinalrecesses or grooves a and a almost diametrically opposite each other,and in one of the same a shaft B mounted longitudinally, on which oneedge of a sheet of rubber B is fastened, the opposite edge of the rubberblanket being held on the edge of the recess or groove a. The rubbersheet passes over a roller B in the groove a adjacent to the shaft B, asshown in Fig. 3. By means of a suitable key the shaft B is turned so asto wind the blanket'B" on it, whereby the said blanket is stretchedfirmly and snugly on about one-half of said printing-cylinder, theblanket being held in this position by a ratchet-and-pawl device 6 inthe groove a and connected with the shaft B.

The impression-cylinder G is mounted in the machine-frame above theprinting-cylinder and in contact therewith. The cylinder G is providedwith a longitudinal recess or groove G, in which a shaft H is mountedlongitudinally and which is arranged to open and close grippers J. Fromthe shaft H a series of grippers J project, which extend be yond theedge of the groove or recess G and can rest their free ends on theperiphery of the cylinder G. An L-shaped abutment or stop K is fastenedto the top edge of each gripper a short distance back from the free endand in such a manner that said abutments or stops pass within the recessor groove G when the grippers rest against the periphery of the cylinderG. The shaft H is provided at one end with an arm L, extending in thereverse direction of the grippers and provided with anantifriction-roller L at its free end.

A circular track M is arranged concentrically with the cylinder G atthat end of the same at which the arm L is located, and on said track acam N is held adjustably, so that it can be fastened'or locked in placeon any part of the circular track.

A lever O is pivoted to the press-frame in such a manner that one endofthe same can act on the free end of the arm L on the shaft H, and tothe opposite end of said lever a rod and G approach closest to eachother, to the standards A and at the opposite end rests on the twostandards S, projecting upward from the frame of the press, the free endbar of the table having pivot-pins T, which can pass into the forkedupper ends of the standards S. V is a handle-lug on the free end of thetable. B y mounting the table in the manner described the operator isenabled to raise the same when the stone F is to be cleaned or adjusted,so that the table will be entirely out of the way of the operator, butcan be brought into its proper position ready for receiving sheets bymerely swinging it down until its free end rests upon the standards Sagain.

The operation is as follows: Vhen the cylinders A and G are in theposition shown in Fig. 3, the rod P is pulled downward by the cam Q, andthereby the arm 0 is pressed upward and the grippers J are moved fromthe periphery of the cylinder G sufficiently to insert the edge tof asheet-metal plate or sheet NV between the cylinder and the uppersurfaces of the grippers. The sheet IV can only be inserted until itstrikes against the abutments or stops K on the grippers, which form agage for holding each and every sheet in precisely the same position onthe cylinder G. Immediately after the sheet has thus been introduced thefree end of the lever O is moved downward, permitting the grippers J,under the action of the coiled gripper-spring I, (shown in dotted linesin Fig. 3,) to grip the edget of the sheet and hold it firmly againstthe cylinder. The metal sheet is now drawn along by the cylinder G, andin so doing is pressed in contact with the previously inked rubberblanket B on the cylinder A, whereby the ink is transferred from saidrubber blanket upon the metal sheet \V. The metalsheet is carried aroundby the cylinder G until the edge 3 of the metal sheet passes frombetween the cylinders A and G, and at that moment the spring-tension insaid metal sheet causes the free end .9 of the same to swing outward andupward from the cylinder G about as shown in Fig. 4, the opposite end Ifof the sheet WV being still held by the grippers J. By this time thecylinder G has 1'o tated so far that the roller L on the arm L strikesagainst the cam N on the curved track M, and thereby said arm is swungtoward the center of the cylinder G and the grippers are swung in thedirection from the periphery of the cylinder, and the end If of themetal sheet is released, permitting the sheet, under its spring-tension,to assume the position (for a moment) shown in full lines in Fig. 5, andthen the sheet slides, as shown in dotted lines in Fig. 5, upon thereeeiving-tablethat is, with the printed surface a: to the top and theunprinted surface y, which rested against the cylinder G, to the bottom.As the printed face does not come in contact with the receiving-table,it is not defaced, but remains clean and perfect. According to thelength of the metal sheet \V, the cam N must be adjusted on the curvedtrack M, longer sheets requiring the same to be set nearer the end m ofsaid track and shorter sheets requiring it to be set nearer the end an.The cam N can also be so set that the grippers release the sheet aninstant after the sheet has been released from between-the twocylinders, or the cam can be so set that the grippers release the sheeta greater or less time after the sheet has been released from betweenthe cylinders; but in all cases the sheet must be released from betweenthe two cylinders before it is released from the grippers.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

In a press for printing sheet-metal plates, the combination with aprinti.ng-cylinder, of an impression cylinder parallel with and in veryclose proximity thereto, the impression cylinder being above theprinting-cylinder and said impression cylinder being provided with alongitudinal groove, grippers on a rocking-shaft in said groove, a fixedcircular track at one end of said impression cylinder and concentrictherewith, a cam mounted adjustably on said track, an arm on therocking-gripper shaft, which arm can be tripped by the cam on thecircular track, a feed-table extending down to within a short distanceof the point of approach of the printing cylinder and impressioncylinder, and a receiving table, the cam being held 011 the circulartrack 011 that half of the track toward the feed-table, so as to holdthat end of the sheet that first entered in between the impressioncylinder and printing cylinders, by means of the grippers, until it hadpassed toward the feeding table beyond the vertical longitudinal planeof the impression cylinder and until the rear end of the sheet hadpassed from between said cylinders, substantially as herein set forth.

In testimony that I claim the foregoing as my invention I have signed myname, in presence of two witnesses, this 6th day of December, 1894.

MORITZ AUERBACII.

lVitnesses:

OSCAR F. GUNZ, D. PETRI-PALMEDO.

IIO

